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Soil Types

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Soil Types

  • Date December 3, 2020
Science Skills – Grade 6 Soil Types

Soil and types of soil.
 

 
Soil is a mixture of broken rocks and materials, living organism, and decaying organic matter called humus. Humus is dark, soft and rich in nutrients. Soil also includes air and water. All living things in the soil, plus essential materials that these organism use to survive from the soil’s ecosystem.
 
Soil profile
 
There are different types of soil, each with its own set of characteristics. Note: When you dig down deep into any soil, you’ll see that it is made of layers or horizons. When you put the horizons together, they form a soil profile.
 
Types of soil
 

 
There are three types of soil. These are sand, silt and clay. Note: Most of these soils are composed of a combination of the different types. How the soils are mixed will determine the texture of the soil, or in other words, how the soil looks and feels.
 
Sand
 
One type of soil is sand. Sand is actually small particles of weathered rocks. Sand is fairly coarse and loose, so water is able to drain through it easily. While it is good for drainage, it is not good for growing plants, because sandy soil will not hold water or nutrients.
 
Silt
 
This is another type of soil. Silt can be thought of as fine sand, and will hold water better than sand. If you were to hold a handful of dry silt in your hand, it would feel almost like flour; and if you were to add water to the silt in your hand, it would do a fair job holding the water and feel smooth.
 
Clay
 
This is a very fine-grained soil. It particles are even smaller than silt, so there is very little space between the tiny grains for air and water to circulate. Therefore clay does not drain well or provide space for plant roots to furnish.
 
Loam
 
This soil is a combination of sand, silt and clay. Loam will vary depending on how much of each component is present, but gradually if you are a gardener, this is the type of soil you want, because it holds moisture but also allows for good drainage.
 
 

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TERM 1 UNIT 1: THE ENVIRONMENT18 In this Unit, students will learn about climate change, its effects and ways of stemming it. They will explore the nature of solid waste pollution, and identify ways in which this problem can be alleviated. In addition, they will study the causes of soil degradation, the methods of preventing soil degradation, and appreciate the importance of caring for the environment.
The Environment
Ecosystems and Biomes
HomeWork – Ecosystems – September 15, 2020
Conservation – Caring for the environment
Human Activities and their effects on the environment
Review Questions – September 24, 2020
Environmental problems – Climate Change
The Greenhouse Effect
Solid Waste Management
Let’s reduce solid waste
Soil Degradation
Soil Eroision
Homework – October 9, 2020
Man-made causes of soil erosion and how we can prevent it
Soil Types
Science project 1
Science Project 2
Science Project 3
TERM 1 UNIT 2: LIGHT AND SOUND7 In this unit, students will investigate the nature of light and sound energy, and how they interact with various materials. They will identify sources of noise pollution, note the harmful effects on humans and be aware of mitigation strategies.
Light
Homework – Review of Light
TERM 2 UNIT 2: HUMAN BODY SYSTEMS3 In this Unit, students will learn about selected human body systems. Through observations, demonstration and research they will identify the organs associated with each system and state their functions. Range of Content • The main structures and functions of selected human body systems  Circulatory system (Heart, blood, blood vessels). The main job of the circulatory system is the transporting materials throughout the body. It carries nutrients, oxygen and water to different parts of the body and removes waste.  Digestive system (mouth, oesophagus, stomach, small intestine, large intestine). The digestive system helps to break down food into a form that the body can find useful.  Excretory system (kidney, bladder, skin, lungs). Substances that may be harmful to the body are removed through the excretory system.  Nervous system (brain, spinal cord, nerves). The nervous system controls the body's actions.  Reproductive system (penis, testes, vagina, ovary, uterus/womb). The reproductive system is responsible for producing offspring.  Respiratory system (nose, trachea, lungs). The respiratory system produces energy from food.  Skeletal and muscular systems (muscles, bones, joints). The muscular and skeletal systems work together to help the body to move. The skeletal system also protects major organs throughout the body.
Light – Reflection Refraction and Absorption
Mirrors
Sound
Review of Light – Quiz – November 20, 2020
Review of sound – December 2, 2020
TERM 2 UNIT 1: MATERIALS PROPERTIES AND USES1 In this unit, students continue to learn about the names, properties and uses of everyday materials begun at the lower grades, are clear about safety at all times, and recognise that materials are handled, stored and disposed of in different ways depending on their properties. Students will plan investigations; including controlling variables where appropriate e.g. fair tests. Students will differentiate between reversible and irreversible changes. They will evaluate, through investigations, whether or not particular changes are reversible. They will assess the usefulness of some reversible and irreversible changes in everyday situations.
Properties and use of selected materials
TERM 2 UNIT 3: MIXTURES1 In this unit, students will learn that substances can be combined to form mixtures. They will classify mixtures according to their properties. They will learn to work cooperatively and develop problem solving skills as they investigate specific methods of separating mixtures. Range of Content • Substances combine to form mixtures • Types of mixtures include solutions, suspensions, and colloids • Mixtures can be physically separated based on size of particles, magnetic properties and how readily they dissolve • Methods of separating mixtures include filtration, evaporation, sieving, and decanting
Digestive System
The Circulatory or CardioVascular System
Respiratory System
Classifying Mixtures
TERM 3 LESSON 1 _ NUTRITION AND DRUGS
April 28, 2020
TERM 3 LESSON 2 - APRIL 29, 2020
Class Activity – Drugs and Awareness – April 29, 2020
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